EARTHSC 1122 Study Guide - Midterm Guide: Central Atlantic Magmatic Province, Lithographic Limestone, Solnhofen Limestone
12 Apr 2016
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Tied to volcanism (volcanoes: central atlantic magmatic province covers 4 million square miles, outpouring of lava because pangea was splitting apart. Lasted for about 4 million years over boundary between triassic and jurassic: diabase/diorite rock- igneous intrusions halfway between granite and gabbro. Intrudes in other rocks, creates iron ore used in revolutionary war and searched for by flying magnetometers: grace mine- seen by flying magnetometer. Hundreds of early dinosaur found in a group, famous petrified forest (log jam) in arizona: chinle, moenkopi, eastern united states: newark super group- 12 major and 30 minor long, narrow rift valleys. Like books leaning next to each other, creating valleys and steep/nice sides. 3 main sedimentary lithologies,: river deposits contain neat footprints, lake deposits: light layers (shallow lakes) and dark layers (deep lakes, hammer creek conglomerate: huge rocks, limestone pieces, iron and feldspar, deposited very close to source.
